/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.execution.fragment;

import com.google.common.collect.ImmutableList;
import org.apache.iotdb.tsfile.utils.PublicBAOS;
import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.Serializable;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

import static com.google.common.collect.ImmutableList.toImmutableList;
import static java.util.Objects.requireNonNull;

/**
 * This class is inspired by Trino <a
 * href="https://github.com/trinodb/trino/blob/master/core/trino-main/src/main/java/io/trino/execution/ExecutionFailureInfo.java">...</a>
 */
public class FragmentInstanceFailureInfo implements Serializable {
    private static final Pattern STACK_TRACE_PATTERN =
            Pattern.compile("(.*)\\.(.*)\\(([^:]*)(?::(.*))?\\)");
    private final String message;
    private final FragmentInstanceFailureInfo cause;
    private final List<FragmentInstanceFailureInfo> suppressed;
    private final List<String> stack;

    public FragmentInstanceFailureInfo(
            String message,
            FragmentInstanceFailureInfo cause,
            List<FragmentInstanceFailureInfo> suppressed,
            List<String> stack) {
        requireNonNull(suppressed, "suppressed is null");
        requireNonNull(stack, "stack is null");

        this.message = message;
        this.cause = cause;
        this.suppressed = ImmutableList.copyOf(suppressed);
        this.stack = ImmutableList.copyOf(stack);
    }

    public String getMessage() {
        return message;
    }

    public FragmentInstanceFailureInfo getCause() {
        return cause;
    }

    public List<FragmentInstanceFailureInfo> getSuppressed() {
        return suppressed;
    }

    public List<String> getStack() {
        return stack;
    }

    public RuntimeException toException() {
        return toException(this);
    }

    public static FragmentInstanceFailureInfo toFragmentInstanceFailureInfo(Throwable throwable) {
        if (throwable == null) {
            return null;
        }
        return new FragmentInstanceFailureInfo(
                throwable.getMessage(),
                toFragmentInstanceFailureInfo(throwable.getCause()),
                Arrays.stream(throwable.getSuppressed())
                        .map(FragmentInstanceFailureInfo::toFragmentInstanceFailureInfo)
                        .collect(Collectors.toList()),
                Arrays.stream(throwable.getStackTrace()).map(Objects::toString).collect(toImmutableList()));
    }

    private static FailureException toException(FragmentInstanceFailureInfo failureInfo) {
        if (failureInfo == null) {
            return null;
        }
        FailureException failure =
                new FailureException(failureInfo.getMessage(), toException(failureInfo.getCause()));
        for (FragmentInstanceFailureInfo suppressed : failureInfo.getSuppressed()) {
            failure.addSuppressed(toException(suppressed));
        }
        ImmutableList.Builder<StackTraceElement> stackTraceBuilder = ImmutableList.builder();
        for (String stack : failureInfo.getStack()) {
            stackTraceBuilder.add(toStackTraceElement(stack));
        }
        ImmutableList<StackTraceElement> stackTrace = stackTraceBuilder.build();
        failure.setStackTrace(stackTrace.toArray(new StackTraceElement[0]));
        return failure;
    }

    public static StackTraceElement toStackTraceElement(String stack) {
        Matcher matcher = STACK_TRACE_PATTERN.matcher(stack);
        if (matcher.matches()) {
            String declaringClass = matcher.group(1);
            String methodName = matcher.group(2);
            String fileName = matcher.group(3);
            int number = -1;
            if (fileName.equals("Native Method")) {
                fileName = null;
                number = -2;
            } else if (matcher.group(4) != null) {
                number = Integer.parseInt(matcher.group(4));
            }
            return new StackTraceElement(declaringClass, methodName, fileName, number);
        }
        return new StackTraceElement("Unknown", stack, null, -1);
    }

    // region serialize && deserialize

    public ByteBuffer serialize() throws IOException {
        PublicBAOS byteArrayOutputStream = new PublicBAOS();
        DataOutputStream outputStream = new DataOutputStream(byteArrayOutputStream);
        serialize(outputStream);
        return ByteBuffer.wrap(byteArrayOutputStream.getBuf(), 0, byteArrayOutputStream.size());
    }

    public void serialize(DataOutputStream outputStream) throws IOException {
        ReadWriteIOUtils.write(message, outputStream);
        if (cause == null) {
            ReadWriteIOUtils.write(0, outputStream);
        } else {
            ReadWriteIOUtils.write(1, outputStream);
            cause.serialize(outputStream);
        }
        ReadWriteIOUtils.write(suppressed.size(), outputStream);
        for (FragmentInstanceFailureInfo failureInfo : suppressed) {
            failureInfo.serialize(outputStream);
        }
        ReadWriteIOUtils.write(stack.size(), outputStream);
        for (String s : stack) {
            ReadWriteIOUtils.write(s, outputStream);
        }
    }

    public static FragmentInstanceFailureInfo deserialize(ByteBuffer byteBuffer) {
        String message = ReadWriteIOUtils.readString(byteBuffer);
        FragmentInstanceFailureInfo cause;
        List<FragmentInstanceFailureInfo> suppressed = new ArrayList<>();
        List<String> stack = new ArrayList<>();
        int flag = ReadWriteIOUtils.readInt(byteBuffer);
        if (flag == 0) {
            cause = null;
        } else {
            cause = deserialize(byteBuffer);
        }
        int suppressedSize = ReadWriteIOUtils.readInt(byteBuffer);
        for (int i = 0; i < suppressedSize; i++) {
            suppressed.add(deserialize(byteBuffer));
        }
        int stackSize = ReadWriteIOUtils.readInt(byteBuffer);
        for (int i = 0; i < stackSize; i++) {
            stack.add(ReadWriteIOUtils.readString(byteBuffer));
        }
        return new FragmentInstanceFailureInfo(message, cause, suppressed, stack);
    }

    // end region

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        FragmentInstanceFailureInfo that = (FragmentInstanceFailureInfo) o;
        return (this.getMessage() == null
                ? that.getMessage() == null
                : this.getMessage().equals(that.getMessage()))
                && (this.getCause() == null
                ? that.getCause() == null
                : this.getCause().equals(that.getCause()))
                && this.getSuppressed().equals(that.getSuppressed())
                && this.getStack().equals(that.getStack());
    }

    private static class FailureException extends RuntimeException {
        FailureException(String message, FailureException cause) {
            super(message, cause);
        }
    }
}
